Quick Tip | Preventing Vacuum Leaks in Over-Pressure Relief Valves

We talk about vacuum leaks on this blog a lot. And for good reason! At least 90 percent of all evaporator performance problems can be traced back to vacuum leaks.           over-pressure relief valves

The potential causes of vacuum leaks are many, from cracks in older equipment to brittle and leaking seals. One preventable source of vacuum leaks is in over-pressure relief valves.

Many evaporators that operate under vacuum use relatively simple over-pressure relief valves to prevent positive pressure in the processing equipment. Many of these valves contain an elastomeric ball that seats against a conical metal surface to create an air-tight seal. When the balls sit in the same position for a long time (which they inevitably do), the balls become “indented” by the metal sealing surface. If/when these valves relieve, the ball often shifts position and seats differently, and the indentation prevents the ball from sealing completely, creating a vacuum leak.

To eliminate this issue, the balls can be rotated so that any indentation(s) are not contacting the sealing surface.

The pictures above and below were taken during a recent visit to a customer site to review their evaporator for potential issues.

If you would like us to perform an assessment of your evaporator, contact us by calling 410-822-6900 or by sending email to problem.solved@caloris.com to be connected with an engineer.


About Caloris

Caloris transforms process systems design for the better with unexpected, future-focused solutions that solve real operational problems. We engineer efficient, dependable and productive solutions that also improve environmental sustainability where practical. Designed with the end user in mind to drive plant productivity. Caloris offers evaporation, membrane filtration and spray drying process systems for food and dairy industries, as well as for water reuse and wastewater treatment applications. Both Caloris’ custom and pre-engineered packaged systems are designed to meet our customers’ specific concentration/purification needs utilizing the most cost effective and energy efficient technologies available. Whether concentrating dairy, food or juice products at a high-volume production facility, or processing industrial wastewaters to reduce transportation and treatment costs and recover re-usable water, Caloris provides a range of options and technologies.